﻿// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

using System;
using System.Collections.Generic;
using System.Linq;
using NuGet;

namespace ICSharpCode.PackageManagement
{
	public class RegisteredPackageRepositories : IRegisteredPackageRepositories
	{
		IPackageRepositoryCache repositoryCache;
		PackageManagementOptions options;
		RegisteredPackageSources registeredPackageSources;
		PackageSource activePackageSource;
		IPackageRepository activePackageRepository;
		
		public RegisteredPackageRepositories(
			IPackageRepositoryCache repositoryCache,
			PackageManagementOptions options)
		{
			this.repositoryCache = repositoryCache;
			this.options = options;
			registeredPackageSources = options.PackageSources;
		}
		
		public IRecentPackageRepository RecentPackageRepository {
			get { return repositoryCache.RecentPackageRepository; }
		}
		
		public IPackageRepository CreateRepository(PackageSource source)
		{
			return repositoryCache.CreateRepository(source.Source);
		}
		
		public IPackageRepository CreateAggregateRepository()
		{
			return repositoryCache.CreateAggregateRepository();
		}
		
		public RegisteredPackageSources PackageSources {
			get { return options.PackageSources; }
		}
		
		public bool HasMultiplePackageSources {
			get { return registeredPackageSources.HasMultipleEnabledPackageSources; }
		}
		
		public PackageSource ActivePackageSource {
			get {
				activePackageSource = options.ActivePackageSource;
				if (activePackageSource == null) {
					List<PackageSource> enabledPackageSources = 
						options.PackageSources.GetEnabledPackageSources().ToList();
					if (enabledPackageSources.Any()) {
						ActivePackageSource = enabledPackageSources[0];
					}
				}
				return activePackageSource;
			}
			set {
				if (activePackageSource != value) {
					activePackageSource = value;
					options.ActivePackageSource = value;
					activePackageRepository = null;
				}
			}
		}
		
		public IPackageRepository ActiveRepository {
			get {
				if (activePackageRepository == null) {
					CreateActiveRepository();
				}
				return activePackageRepository;
			}
		}
		
		void CreateActiveRepository()
		{
			EnsureActivePackageSourceIsConfigured();
			
			if (ActivePackageSource.IsAggregate()) {
				activePackageRepository = CreateAggregateRepository();
			} else {
				activePackageRepository = repositoryCache.CreateRepository(ActivePackageSource.Source);
			}
		}
		
		void EnsureActivePackageSourceIsConfigured()
		{
			if (ActivePackageSource == null) {
				throw new NoPackageSourcesConfiguredException();
			}
		}
		
		public void UpdatePackageSources(IEnumerable<PackageSource> updatedPackageSources)
		{
			PackageSources.Clear();
 			foreach (PackageSource updatedPackageSource in updatedPackageSources) {
 				PackageSources.Add(updatedPackageSource);
 			}
			
			UpdateActivePackageSource();
		}
		
		void UpdateActivePackageSource()
		{
			if (activePackageSource == null)
				return;
			
			if (activePackageSource.IsAggregate()) {
				if (!HasMultiplePackageSources) {
					ActivePackageSource = null;
				}
			} else {
				PackageSource matchedPackageSource = PackageSources
					.GetEnabledPackageSources()
					.FirstOrDefault(packageSource => packageSource.Equals(activePackageSource));
				
				if (matchedPackageSource == null) {
					ActivePackageSource = null;
				}
			}
		}
	}
}
